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Behavioural adaptations of mussels to varying levels of food availability and predation risk

机译：贻贝对食物供应和捕食风险的不同程度的行为适应

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摘要

Blue mussels Mytilus edulis (n = 14) were studied in the laboratory using Hall sensor systems to record their gaping behaviour when exposed to varying food rations and levels of predation risk. Mussel response to increasing daily algal ration was to increase mean gape angle per day and was associated with copious pseudofaeces production at excessive initial algal concentrations, e.g. 250 cells/µl. Mean gape angle decreased (backward S-shaped curve) when fed a fixed algal ration per day where simulated predation risk (introduced fresh mussel homogenate) increased in the water, presumably as an anti-predation strategy. However, this behaviour is presumed to lower feeding rates. There was a general positive relationship between both gape angle and the extent of valve movement (abduction/adduction) per event and valve movement speed. However, the fastest valve adduction events, which resulted in valve closure, were recorded independent of gape angle and only when mussels were first exposed to high perceived predation risk. We interpret this as an appropriate response, with high energetic cost, as a first line of defence from predators such as starfish and crabs. Overall, mussel response to predation appears graded and complex, indicating a trade-off between maximizing feeding/pseudofaeces production and minimizing predation risk.
机译：在实验室中使用霍尔传感器系统研究了蓝贻贝（Mytilus edulis）（n = 14），以记录它们在不同食物配比和捕食风险水平下的张开行为。贻贝对每日藻类定量增加的反应是每天平均间隙角增加，并且与初始藻类浓度过高时大量假粪便的产生有关，例如： 250细胞/微升。每天饲喂固定的藻类定量饲料时，平均间隙角减小（向后的S形曲线），而水中模拟的捕食风险（引入的新鲜贻贝匀浆）增加，这可能是一种反捕食策略。但是，推测此行为会降低进料速度。间隙角与每个事件的气门运动程度（外展/内收）和气门运动速度之间通常存在正相关关系。但是，记录的最快阀门内收事件（导致阀门关闭）与间隙角无关，并且仅在贻贝首次暴露于高感知捕食风险时才记录。我们将其解释为一种适当的应对措施，需要付出高昂的精力，这是海星和螃蟹等天敌的第一道防线。总体而言，贻贝对捕食的反应似乎是分级的和复杂的，这表明在最大程度增加摄食/假粪便产量与最小化捕食风险之间要进行权衡。

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  • 来源
    《Journal of Molluscan Studies》 |2010年第4期|p.348-353|共6页
  • 作者

    Anthony A. Robson; Carlos Garcia De Leaniz; Rory P. Wilson;

  • 作者单位

    Laboratoire des Sciences de L'Environnement Marin (UMR CNRS 6539), Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, Technopôle Brest Iroise, Place Nicolas Copernic, 29280 Plouzané, France;

    Department of Pure and Applied Ecology, Institute of Environmental Sustainability, School of the Environment and Society, Swansea University, Singleton Park, Swansea SA2 8PP, UK;

    Department of Pure and Applied Ecology, Institute of Environmental Sustainability, School of the Environment and Society, Swansea University, Singleton Park, Swansea SA2 8PP, UK;

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